Automotive 1 Mbit serial SPI bus EEPROMs with high-speed ...This is information on a product in full...

This is information on a product in full production.

October 2014 DocID023214 Rev 6 1/40

M95M01-A125 M95M01-A145

Automotive 1 Mbit serial SPI bus EEPROMs with high-speed clock

Datasheet - production data

Features• Compatible with the Serial Peripheral Interface

(SPI) bus• Memory array

– 1 Mbit (128 Kbytes) of EEPROM– Page size: 256 bytes– Write protection by block: 1/4, 1/2 or whole

memory– Additional Write lockable Page

(Identification page)• Extended temperature and voltage ranges

– Up to 125 °C (VCC from 2.5 V to 5.5 V)– Up to 145 °C (VCC from 2.5 V to 5.5 V)

• High speed clock frequency– 16 MHz for VCC ≥ 4.5 V – 10 MHz for VCC ≥ 2.5 V

• Schmitt trigger inputs for noise filtering• Short Write cycle time

– Byte Write within 4 ms – Page Write within 4 ms

• Write cycle endurance– 4 million Write cycles at 25 °C– 1.2 million Write cycles at 85 °C– 600 k Write cycles at 125 °C– 400 k Write cycles at 145 °C

• Data retention– 50 years at 125 °C– 100 years at 25 °C

• ESD Protection (Human Body Model)– 4000 V

• Packages– RoHS-compliant and halogen-free

(ECOPACK2®)

SO8 (MN)150 mil width

TSSOP8 (DW)169 mil width

www.st.com

http://www.st.com

Contents M95M01-A125 M95M01-A145

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Contents

1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1 Serial Data output (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 Serial Data input (D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Serial Clock (C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 Chip Select (S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5 Hold (HOLD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.6 Write Protect (W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.7 VSS ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.8 VCC supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Operating features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.1 Active power and Standby power modes . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 SPI modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3 Hold mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.4 Protocol control and data protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113.4.1 Protocol control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.4.2 Status Register and data protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5 Identification page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154.1 Write Enable (WREN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2 Write Disable (WRDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3 Read Status Register (RDSR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.4 Write Status Register (WRSR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.5 Read from Memory Array (READ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.6 Write to Memory Array (WRITE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.7 Read Identification Page (RDID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.8 Write Identification Page (WRID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.9 Read Lock Status (RDLS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.10 Lock Identification Page (LID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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5 Application design recommendations . . . . . . . . . . . . . . . . . . . . . . . . . 265.1 Supply voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.1.1 Operating supply voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.1.2 Power-up conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.1.3 Power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.2 Implementing devices on SPI bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3 Cycling with Error Correction Code (ECC) . . . . . . . . . . . . . . . . . . . . . . . . 28

6 Delivery state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

8 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

10 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

List of tables M95M01-A125 M95M01-A145

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List of tables

Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Table 2. Status Register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Table 3. Write-protected block size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Table 4. Protection modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Table 5. Device identification bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Table 6. Instruction set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Table 7. Significant bits within the address bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Table 8. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Table 9. Cycling performance by groups of 4 bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Table 10. Operating conditions (voltage range W, temperature range 4). . . . . . . . . . . . . . . . . . . . . . 30Table 11. Operating conditions (voltage range W, temperature range 3). . . . . . . . . . . . . . . . . . . . . . 30Table 12. Operating conditions (voltage range W, temperature range 3)

for high-speed communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Table 13. DC characteristics (voltage range W, temperature range 4). . . . . . . . . . . . . . . . . . . . . . . . 31Table 14. DC characteristics (voltage range W, temperature range 3). . . . . . . . . . . . . . . . . . . . . . . . 32Table 15. AC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Table 16. SO8N – 8-lead plastic small outline, 150 mils body width, package mechanical data . . . . 36Table 17. TSSOP8 – 8-lead thin shrink small outline, package mechanical data. . . . . . . . . . . . . . . . 37Table 18. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Table 19. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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List of figures

Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 2. 8-pin package connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 3. SPI modes supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 4. Hold mode activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 5. Write Enable (WREN) sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Figure 6. Write Disable (WRDI) sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Figure 7. Read Status Register (RDSR) sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 8. Write Status Register (WRSR) sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 9. Read from Memory Array (READ) sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 10. Byte Write (WRITE) sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 11. Page Write (WRITE) sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 12. Read Identification Page sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Figure 13. Write Identification Page sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Figure 14. Read Lock Status sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 15. Lock ID sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 16. Bus master and memory devices on the SPI bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Figure 17. AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Figure 18. Serial input timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Figure 19. Hold timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Figure 20. Serial output timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Figure 21. SO8N – 8-lead plastic small outline, 150 mils body width, package outline . . . . . . . . . . . . 36Figure 22. TSSOP8 – 8-lead thin shrink small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . 37

Description M95M01-A125 M95M01-A145

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1 Description

The M95M01-A125 and M95M01-A145 are 1-Mbit serial EEPROM Automotive grade devices operating up to 145°C. They are compliant with the very high level of reliability defined by the Automotive standard AEC-Q100 grade 0.

The devices are accessed by a simple serial SPI compatible interface running up to 16 MHz.

The memory array is based on advanced true EEPROM technology (Electrically Erasable PROgrammable Memory). The M95M01-A125 and M95M01-A145 are byte-alterable memories (131072 × 8 bits) organized as 512 pages of 256 bytes in which the data integrity is significantly improved with an embedded Error Correction Code logic.

The M95M01-A125 and M95M01-A145 offer an additional Identification Page (256 bytes) in which the ST device identification can be read. This page can also be used to store sensitive application parameters which can be later permanently locked in read-only mode.

Figure 1. Logic diagram

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Figure 2. 8-pin package connections

1. See Package mechanical data section for package dimensions and how to identify pin-1.

Table 1. Signal namesSignal name Description

C Serial Clock

D Serial data input

Q Serial data output

S Chip Select

W Write Protect

HOLD Hold

VCC Supply voltage

VSS Ground

Signal description M95M01-A125 M95M01-A145

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2 Signal description

All input signals must be held high or low (according to voltages of VIH or VIL, as specified in Table 13 and Table 14). These signals are described below.

2.1 Serial Data output (Q)This output signal is used to transfer data serially out of the device during a Read operation. Data is shifted out on the falling edge of Serial Clock (C), most significant bit (MSB) first. In all other cases, the Serial Data output is in high impedance.

2.2 Serial Data input (D)This input signal is used to transfer data serially into the device. D input receives instructions, addresses, and the data to be written. Values are latched on the rising edge of Serial Clock (C), most significant bit (MSB) first.

2.3 Serial Clock (C)This input signal allows to synchronize the timing of the serial interface. Instructions, addresses, or data present at Serial Data Input (D) are latched on the rising edge of Serial Clock (C). Data on Serial Data Output (Q) changes after the falling edge of Serial Clock (C).

2.4 Chip Select (S)Driving Chip Select (S) low selects the device in order to start communication. Driving Chip Select (S) high deselects the device and Serial Data output (Q) enters the high impedance state.

2.5 Hold (HOLD)The Hold (HOLD) signal is used to pause any serial communications with the device without deselecting the device.

2.6 Write Protect (W)This pin is used to write-protect the Status Register.

2.7 VSS groundVSS is the reference for all signals, including the VCC supply voltage.

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2.8 VCC supply voltageVCC is the supply voltage pin. Refer to Section 3.1: Active power and Standby power modes and to Section 5.1: Supply voltage (VCC).

Operating features M95M01-A125 M95M01-A145

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3 Operating features

3.1 Active power and Standby power modesWhen Chip Select (S) is low, the device is selected and in the Active power mode.

When Chip Select (S) is high, the device is deselected. If a Write cycle is not currently in progress, the device then goes in to the Standby power mode, and the device consumption drops to ICC1, as specified in Table 13 and Table 14.

3.2 SPI modesThe device can be driven by a microcontroller with its SPI peripheral running in either of the two following modes:• CPOL=0, CPHA=0• CPOL=1, CPHA=1

For these two modes, input data is latched in on the rising edge of Serial Clock (C), and output data is available from the falling edge of Serial Clock (C).

The difference between the two modes, as shown in Figure 3, is the clock polarity when the bus master is in Stand-by mode and not transferring data:• C remains at 0 for (CPOL=0, CPHA=0)• C remains at 1 for (CPOL=1, CPHA=1)

Figure 3. SPI modes supported

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3.3 Hold modeThe Hold (HOLD) signal is used to pause any serial communications with the device without resetting the clocking sequence.

The Hold mode starts when the Hold (HOLD) signal is driven low and the Serial Clock (C) is low (as shown in Figure 4). During the Hold mode, the Serial Data output (Q) is high impedance, and the signals present on Serial Data input (D) and Serial Clock (C) are not decoded. The Hold mode ends when the Hold (HOLD) signal is driven high and the Serial Clock (C) is or becomes low.

Figure 4. Hold mode activation

Deselecting the device while it is in Hold mode resets the paused communication.

3.4 Protocol control and data protection

3.4.1 Protocol controlThe Chip Select (S) input offers a built-in safety feature, as the S input is edge-sensitive as well as level-sensitive: after power-up, the device is not selected until a falling edge has first been detected on Chip Select (S). This ensures that Chip Select (S) must have been high prior to going low, in order to start the first operation.

For Write commands (WRITE, WRSR, WRID, LID) to be accepted and executed:• the Write Enable Latch (WEL) bit must be set by a Write Enable (WREN) instruction• a falling edge and a low state on Chip Select (S) during the whole command must be

decoded• instruction, address and input data must be sent as multiple of eight bits• the command must include at least one data byte• Chip Select (S) must be driven high exactly after a data byte boundary

Write command can be discarded at any time by a rising edge on Chip Select (S) outside of a byte boundary.

To execute Read commands (READ, RDSR, RDID, RDLS), the device must decode:• a falling edge and a low level on Chip Select (S) during the whole command• instruction and address as multiples of eight bits (bytes)

From this step, data bits are shifted out until the rising edge on Chip Select (S).


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3.4.2 Status Register and data protectionThe Status Register format is shown in Table 2 and the status and control bits of the Status Register are as follows:

Note: Bits b6, b5, b4 are always read as 0.

WIP bit

The WIP bit (Write In Progress) is a read-only flag that indicates the Ready/Busy state of the device. When a Write command (WRITE, WRSR, WRID, LID) has been decoded and a Write cycle (tW) is in progress, the device is busy and the WIP bit is set to 1. When WIP=0, the device is ready to decode a new command.

During a Write cycle, reading continuously the WIP bit allows to detect when the device becomes ready (WIP=0) to decode a new command.

WEL bit

The WEL bit (Write Enable Latch) bit is a flag that indicates the status of the internal Write Enable Latch. When WEL is set to 1, the Write instructions (WRITE, WRSR, WRID, LID) are executed; when WEL is set to 0, any decoded Write instruction is not executed.

The WEL bit is set to 1 with the WREN instruction. The WEL bit is reset to 0 after the following events:• Write Disable (WRDI) instruction completion• Write instructions (WRITE, WRSR, WRID, LID) completion including the write cycle

time tW• Power-up

BP1, BP0 bits

The Block Protect bits (BP1, BP0) are non-volatile. BP1,BP0 bits define the size of the memory block to be protected against write instructions, as defined in Table 2. These bits are written with the Write Status Register (WRSR) instruction, provided that the Status Register is not protected (refer to “SRWD bit and W input signal”, on page 13).

Table 2. Status Register formatb7 b6 b5 b4 b3 b2 b1 b0

SRWD 0 0 0 BP1 BP0 WEL WIP

Status Register Write Protect

Block Protect bits

Write Enable Latch bit

Write In Progress bit

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SRWD bit and W input signal

The Status Register Write Disable (SRWD) bit is operated in conjunction with the Write Protect pin (W) signal. When the SRWD bit is written to 0, it is possible to write the Status Register, regardless of whether the pin Write Protect (W) is driven high or low.

When the SRWD bit is written to 1, two cases have to be considered, depending on the state of the W input pin:• Case 1: if pin W is driven high, it is possible to write the Status Register.• Case 2: if pin W is driven low, it is not possible to write the Status Register (WRSR is

discarded) and therefore SRWD,BP1,BP0 bits cannot be changed (the size of the protected memory block defined by BP1,BP0 bits is frozen).

Case 2 can be entered in either sequence:• Writing SRWD bit to 1 after driving pin W low, or• Driving pin W low after writing SRWD bit to 1.

The only way to exit Case 2 is to pull pin W high.

Note: if pin W is permanently tied high, the Status Register cannot be write-protected.

The protection features of the device are summarized in Table 4.

3.5 Identification pageThe M95M01-A125 and M95M01-A145 offer an Identification page (256 bytes) in addition to the 1 Mbit memory. The Identification page contains two fields:• Device identification: the three first bytes are programmed by STMicroelectronics with

the Device identification code, as shown in Table 5.• Application parameters: the bytes after the Device identification code are available for

application specific data.

Table 3. Write-protected block sizeStatus Register bits

Protected block Protected array addressesBP1 BP0

0 0 None None

0 1 Upper quarter 1.80.00h - 1.FF.FFh

1 0 Upper half 1.00.00h - 1.FF.FFh

1 1 Whole memory 0.00.00h - 1FF.FFh plus Identification page

Table 4. Protection modesSRWD bit W signal Status

0 XStatus Register is writable.

1 1

1 0 Status Register is write-protected.


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Note: If the end application does not need to read the Device identification code, this field can be overwritten and used to store application-specific data. Once the application-specific data are written in the Identification page, the whole Identification page should be permanently locked in Read-only mode.

The Read, Write, Lock Identification Page instructions are detailed in Section 4: Instructions.

Table 5. Device identification bytesAddress in

Identification page Content Value

00h ST Manufacturer code 20h

01h SPI Family code 00h

02h Memory Density code 11h (1 Mbit)

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4 Instructions

Each command is composed of bytes (MSBit transmitted first), initiated with the instruction byte, as summarized in Table 6.

If an invalid instruction is sent (one not contained in Table 6), the device automatically enters a Wait state until deselected.

For read and write commands to memory array and Identification Page, the address is defined by three bytes as explained in Table 7.

Table 6. Instruction set

Instruction Description Instruction format

WREN Write Enable 0000 0110

WRDI Write Disable 0000 0100

RDSR Read Status Register 0000 0101

WRSR Write Status Register 0000 0001

READ Read from Memory Array 0000 0011

WRITE Write to Memory Array 0000 0010

RDID Read Identification Page 1000 0011

WRID Write Identification Page 1000 0010

RDLS Reads the Identification Page lock status. 1000 0011

LID Locks the Identification page in read-only mode. 1000 0010

Table 7. Significant bits within the address bytes(1) (2)

InstructionUpper address byteb23 b22 ... b17 b16

Middle address byteb15 b14 ... b10 b9 b8

Lower address byteb7 b6 ... b2 b1 b0

READ or WRITE x x ... x A16 A15 A14 ... A10 A9 A8 A7 A6 ... A1 A0

RDID or WRID 0 0 ... 0 0 0 0 ... 0 0 0 A7 A6 ... A1 A0

RDLS or LID 0 0 ... 0 0 0 0 0 0 . 0 1 0 0 0 0 ... 0 0

1. A: Significant address bit.

2. x: bit is Don’t Care.

Instructions M95M01-A125 M95M01-A145

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4.1 Write Enable (WREN)The WREN instruction must be decoded by the device before a write instruction (WRITE, WRSR, WRID or LID).

As shown in Figure 5, to send this instruction to the device, Chip Select (S) is driven low, the bits of the instruction byte are shifted in (MSB first) on Serial Data Input (D) after what the Chip Select (S) input is driven high and the WEL bit is set (Status Register bit).

Figure 5. Write Enable (WREN) sequence

4.2 Write Disable (WRDI)One way of resetting the WEL bit (in the Status Register) is to send a Write Disable instruction to the device.

As shown in Figure 6, to send this instruction to the device, Chip Select (S) is driven low, and the bits of the instruction byte are shifted in (MSB first), on Serial Data Input (D), after what the Chip Select (S) input is driven high and the WEL bit is reset (Status Register bit).

If a Write cycle is currently in progress, the WRDI instruction is decoded and executed and the WEL bit is reset to 0 with no effect on the ongoing Write cycle.

Figure 6. Write Disable (WRDI) sequence

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4.3 Read Status Register (RDSR)The Read Status Register (RDSR) instruction is used to read the content of the Status Register.

As shown in Figure 7, to send this instruction to the device, Chip Select (S) is first driven low. The bits of the instruction byte are shifted in (MSB first) on Serial Data Input (D), the Status Register content is then shifted out (MSB first) on Serial Data Output (Q).

If Chip Select (S) continues to be driven low, the Status Register content is continuously shifted out.

The Status Register can always be read, even if a Write cycle (tW) is in progress. The Status Register functionality is detailed in Section 3.4.2: Status Register and data protection.

Figure 7. Read Status Register (RDSR) sequence


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4.4 Write Status Register (WRSR)The Write Status Register (WRSR) instruction allows new values to be written to the Status Register. Before it can be accepted, a Write Enable (WREN) instruction must previously have been executed.

The Write Status Register (WRSR) instruction is entered (MSB first) by driving Chip Select (S) low, sending the instruction code followed by the data byte on Serial Data input (D), and driving the Chip Select (S) signal high.

The contents of the SRWD and BP1, BP0 bits are updated after the completion of the WRSR instruction, including the Write cycle (tW).

The Write Status Register (WRSR) instruction has no effect on the b6, b5, b4, b1 and b0 bits in the Status Register (see Table 2: Status Register format).

The Status Register functionality is detailed in Section 3.4.2: Status Register and data protection.

The instruction is not accepted, and is not executed, if a Write cycle is currently in progress.

Figure 8. Write Status Register (WRSR) sequence

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4.5 Read from Memory Array (READ)The READ instruction is used to read the content of the memory.

As shown in Figure 9, to send this instruction to the device, Chip Select (S) is first driven low.

The bits of the instruction byte and address bytes are shifted in (MSB first) on Serial Data Input (D) and the addressed data byte is then shifted out (MSB first) on Serial Data Output (Q). The first addressed byte can be any byte within any page.

If Chip Select (S) continues to be driven low, the internal address register is automatically incremented, and the next byte of data is shifted out. The whole memory can therefore be read with a single READ instruction.

When the highest address is reached, the address counter rolls over to zero, allowing the Read cycle to be continued indefinitely.

The Read cycle is terminated by driving Chip Select (S) high at any time when the data bits are shifted out on Serial Data Output (Q).


Figure 9. Read from Memory Array (READ) sequence

1. Depending on the memory size, as shown in Table 7, the most significant address bits are Don’t Care.

C

D

AI13878

S

Q

23

21 3 4 5 6 7 8 9 10 28 29 30 31 32 33 34 35

22 21 3 2 1 0

36 37 38

7 6 5 4 3 1 70High Impedance

Data Out 1

Instruction 24-bit address

0

MSB

MSB

2

39

Data Out 2


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4.6 Write to Memory Array (WRITE)The WRITE instruction is used to write new data in the memory.

As shown in Figure 10, to send this instruction to the device, Chip Select (S) is first driven low. The bits of the instruction byte, address bytes, and at least one data byte are then shifted in (MSB first), on Serial Data Input (D). The instruction is terminated by driving Chip Select (S) high at a data byte boundary. Figure 10 shows a single byte write.

Figure 10. Byte Write (WRITE) sequence


A Page write is used to write several bytes inside a page, with a single internal Write cycle.

For a Page write, Chip Select (S) has to remain low, as shown in Figure 11, so that the next data bytes are shifted in. Each time a new data byte is shifted in, the least significant bits of the internal address counter are incremented. If the address counter exceeds the page boundary (the page size is 256 bytes), the internal address pointer rolls over to the beginning of the same page where next data bytes will be written. If more than 256 bytes are received, only the last 256 bytes are written.

For both Byte write and Page write, the self-timed Write cycle starts from the rising edge of Chip Select (S), and continues for a period tW (as specified in Table 15).

The instruction is discarded, and is not executed, under the following conditions:• if a Write cycle is already in progress• if the addressed page is in the region protected by the Block Protect (BP1 and BP0)

bits• if one of the conditions defined in Section 3.4.1 is not satisfied

Note: The self-timed Write cycle tW is internally executed as a sequence of two consecutive events: [Erase addressed byte(s)], followed by [Program addressed byte(s)]. An erased bit is read as “0” and a programmed bit is read as “1”.

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Figure 11. Page Write (WRITE) sequence



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4.7 Read Identification Page (RDID)The Read Identification Page instruction is used to read the Identification Page (additional page of 256 bytes which can be written and later permanently locked in Read-only mode).

The Chip Select (S) signal is first driven low, the bits of the instruction byte and address bytes are then shifted in (MSB first) on Serial Data input (D). Address bit A10 must be 0 and the other upper address bits are Don't Care (it might be easier to define these bits as 0, as shown in Table 7). The data byte pointed to by the lower address bits [A7:A0] is shifted out (MSB first) on Serial Data output (Q).

The first byte addressed can be any byte within the identification page.

If Chip Select (S) continues to be driven low, the internal address register is automatically incremented and the byte of data at the new address is shifted out.

Note that there is no roll over feature in the Identification Page. The address of bytes to read must not exceed the page boundary.

The read cycle is terminated by driving Chip Select (S) high. The rising edge of the Chip Select (S) signal can occur at any time when the data bits are shifted out.


Figure 12. Read Identification Page sequence

The first three bytes of the Identification page offer information about the device itself. Please refer to Section 3.5: Identification page for more information.

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4.8 Write Identification Page (WRID)The Write Identification Page instruction is used to write the Identification Page (additional page of 256 bytes which can also be permanently locked in Read-only mode).

The Chip Select signal (S) is first driven low, and then the bits of the instruction byte, address bytes, and at least one data byte are shifted in (MSB first) on Serial Data input (D). Address bit A10 must be 0 and the other upper address bits are Don't Care (it might be easier to define these bits as 0, as shown in Table 7). The lower address bits [A7:A0] define the byte address inside the identification page.

The self-timed Write cycle starts from the rising edge of Chip Select (S), and continues for a period tW (as specified in Table 15).

Figure 13. Write Identification Page sequence

Note: The first three bytes of the Identification page offer the Device Identification code (Please refer to Section 3.5: Identification page for more information). Using the WRID command on these first three bytes overwrites the Device Identification code.

The instruction is discarded, and is not executed, under the following conditions:• If a Write cycle is already in progress• If the Block Protect bits (BP1,BP0) = (1,1)• If one of the conditions defined in Section 3.4.1: Protocol control is not satisfied.

4.9 Read Lock Status (RDLS)The Read Lock Status instruction is used to read the lock status.

To send this instruction to the device, Chip Select (S) first has to be driven low. The bits of the instruction byte and address bytes are then shifted in (MSB first) on Serial Data input (D). Address bit A10 must be 1; all other address bits are Don't Care (it might be easier to define these bits as 0, as shown in Table 7). The Lock bit is the LSB (Least Significant Bit) of the byte read on Serial Data output (Q). It is at ‘1’ when the lock is active and at ‘0’ when the lock is not active. If Chip Select (S) continues to be driven low, the same data byte is shifted out.

The read cycle is terminated by driving Chip Select (S) high. The instruction sequence is shown in Figure 14.


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The Read Lock Status instruction is not accepted and not executed if a Write cycle is currently in progress.

Figure 14. Read Lock Status sequence

4.10 Lock Identification Page (LID)The Lock Identification Page (LID) command is used to permanently lock the Identification Page in Read-only mode.

The LID instruction is issued by driving Chip Select (S) low, sending (MSB first) the instruction code, the address and a data byte on Serial Data input (D), and driving Chip Select (S) high. In the address sent, A10 must be equal to 1. All other address bits are Don't Care (it might be easier to define these bits as 0, as shown in Table 7). The data byte sent must be equal to the binary value xxxx xx1x, where x = Don't Care. The LID instruction is terminated by driving Chip Select (S) high at a data byte boundary, otherwise, the instruction is not executed.

Figure 15. Lock ID sequence

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Driving Chip Select (S) high at a byte boundary of the input data triggers the self-timed Write cycle which duration is tW (specified in Table 15). The instruction sequence is shown in Figure 15.

The instruction is discarded, and is not executed, under the following conditions:• If a Write cycle is already in progress• If the Block Protect bits (BP1,BP0) = (1,1)• If one of the conditions defined in Section 3.4.1: Protocol control is not satisfied.

Application design recommendations M95M01-A125 M95M01-A145

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5 Application design recommendations

5.1 Supply voltage (VCC)

5.1.1 Operating supply voltage (VCC)

Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage within the specified [VCC(min), VCC(max)] range must be applied (see Table 10 and Table 11).

This voltage must remain stable and valid until the end of the transmission of the instruction and, for a Write instruction, until the completion of the internal Write cycle (tW). In order to secure a stable DC supply voltage, it is recommended to decouple the VCC line with a suitable capacitor (usually of the order of 10 nF to 100 nF) close to the VCC/VSS package pins.

5.1.2 Power-up conditionsWhen the power supply is turned on, VCC continuously rises from VSS to VCC. During this time, the Chip Select (S) line is not allowed to float but should follow the VCC voltage. It is therefore recommended to connect the S line to VCC via a suitable pull-up resistor (see Figure 16).

The VCC voltage has to rise continuously from 0 V up to the minimum VCC operating voltage defined in Table 13 and Table 14.

In order to prevent inadvertent write operations during power-up, a power-on-reset (POR) circuit is included.

At power-up, the device does not respond to any instruction until VCC reaches the internal threshold voltage (this threshold is defined in the DC characteristics tables 13 and 14 as VRES).

When VCC passes over the POR threshold, the device is reset and in the following state:• in the Standby power mode• deselected• Status register values:

– Write Enable Latch (WEL) bit is reset to 0.– Write In Progress (WIP) bit is reset to 0.– SRWD, BP1 and BP0 bits remain unchanged (non-volatile bits).

• not in the Hold condition

As soon as the VCC voltage has reached a stable value within [VCC(min), VCC(max)] range, the device is ready for operation.

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5.1.3 Power-downDuring power-down (continuous decrease in the VCC supply voltage below the minimum VCC operating voltage defined in Table 13 and Table 14), the device must be:• deselected (Chip Select (S) should be allowed to follow the voltage applied on VCC),• in Standby power mode (there should not be any internal Write cycle in progress).

5.2 Implementing devices on SPI busFigure 16 shows an example of three devices, connected to the SPI bus master. Only one device is selected at a time, so that only the selected device drives the Serial Data output (Q) line. All the other devices outputs are then in high impedance.

Figure 16. Bus master and memory devices on the SPI bus

1. The Write Protect (W) and Hold (HOLD) signals must be driven high or low as appropriate.

A pull-up resistor connected on each /S input (represented in Figure 16) ensures that each device is not selected if the bus master leaves the /S line in the high impedance state.

Application design recommendations M95M01-A125 M95M01-A145

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5.3 Cycling with Error Correction Code (ECC)The Error Correction Code (ECC) is an internal logic function which is transparent for the SPI communication protocol.

The ECC logic is implemented on each group of four EEPROM bytes(a). Inside a group, if a single bit out of the four bytes happens to be erroneous during a Read operation, the ECC detects this bit and replaces it with the correct value. The read reliability is therefore much improved.

Even if the ECC function is performed on groups of four bytes, a single byte can be written/cycled independently. In this case, the ECC function also writes/cycles the three other bytes located in the same group(a). As a consequence, the maximum cycling budget is defined at group level and the cycling can be distributed over the 4 bytes of the group: the sum of the cycles seen by byte0, byte1, byte2 and byte3 of the same group must remain below the maximum value defined in Table 9: Cycling performance by groups of 4 bytes.

Example1: maximum cycling limit reached with 1 million cycles per byte

Each byte of a group can be equally cycled 1 million times (at 25 °C) so that the group cycling budget is 4 million cycles.

Example2: maximum cycling limit reached with unequal byte cycling

Inside a group, byte0 can be cycled 2 million times, byte1 can be cycled 1 million times, byte2 and byte3 can be cycled 500,000 times, so that the group cycling budget is 4 million cycles.

a. A group of four bytes is located at addresses [4*N, 4*N+1, 4*N+2, 4*N+3], where N is an integer.

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6 Delivery state

The device is delivered with:• the memory array set to all 1s (each byte = FFh),• Status register: bit SRWD =0, BP1 =0 and BP0 =0,• Identification page: the first three bytes define the Device identification code (value

defined in Table 5). The content of the following bytes is Don’t Care.

7 Absolute maximum ratings

Stressing the device outside the ratings listed in Table 8 may cause permanent damage to the device. These are stress ratings only, and operation of the device at these, or any other conditions outside those indicated in the operating sections of this specification, is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Table 8. Absolute maximum ratingsSymbol Parameter Min. Max. Unit

TSTG Storage temperature –65 150 °C

TAMR Ambient operating temperature –40 150 °C

TLEAD Lead temperature during soldering See note (1)

1. Compliant with JEDEC Std J-STD-020D (for small body, Sn-Pb or Pb-free assembly), the ST ECOPACK® 7191395 specification, and the European directive on Restrictions of Hazardous Substances (RoHS directive 2011/65/EU of July 2011).

°C

VO Voltage on Q pin –0.50 VCC+0.6 V

VI Input voltage –0.50 6.5 V

IOL DC output current (Q = 0) - 5 mA

IOH DC output current (Q = 1) - 5 mA

VCC Supply voltage –0.50 6.5 V

VESD Electrostatic pulse (Human Body Model)(2)

2. Positive and negative pulses applied on pin pairs, in accordance with AEC-Q100-002 (compliant with ANSI/ESDA/JEDEC JS-001-2012, C1=100 pF, R1=1500 Ω, R2=500 Ω)

- 4000 V

DC and AC parameters M95M01-A125 M95M01-A145

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8 DC and AC parameters

This section summarizes the operating conditions and the DC/AC characteristics of the device.

Table 9. Cycling performance by groups of 4 bytesSymbol Parameter Test condition Min. Max. Unit

Ncycle Write cycle endurance(1)

TA ≤ 25 °C, 2.5 V < VCC < 5.5 V - 4,000,000

Write cycle(2)

TA = 85 °C, 2.5 V < VCC < 5.5 V - 1,200,000

TA = 125 °C, 2.5 V < VCC < 5.5 V - 600,000

TA = 145 °C(3), 2.5 V < VCC < 5.5 V - 400,000

1. The Write cycle endurance is defined for groups of four data bytes located at addresses [4*N, 4*N+1, 4*N+2, 4*N+3] where N is an integer, or for the status register byte (refer also to Section 5.3: Cycling with Error Correction Code (ECC)). The Write cycle endurance is defined by characterization and qualification.

2. A Write cycle is executed when either a Page Write, a Byte Write, a WRSR, a WRID or an LID instruction is decoded. When using the Byte Write, the Page Write or the WRID, refer also to Section 5.3: Cycling with Error Correction Code (ECC).

3. For temperature range 4 only.

Table 10. Operating conditions (voltage range W, temperature range 4)Symbol Parameter Conditions Min. Max. Unit

VCC Supply voltage - 2.5 5.5 V

TA Ambient operating temperature - –40 145 °C

fC Operating clock frequency5.5 V ≥ VCC ≥ 2.5 V, capacitive load on Q pin ≤ 100pF - 10 MHz

Table 11. Operating conditions (voltage range W, temperature range 3)Symbol Parameter Conditions Min. Max. Unit



fC Operating clock frequency VCC ≥ 2.5 V, capacitive load on Q pin ≤ 100pF - 10 MHz

Table 12. Operating conditions (voltage range W, temperature range 3)for high-speed communications

Symbol Parameter Conditions Min. Max. Unit



fC Operating clock frequency VCC ≥ 4.5 V, capacitive load on Q pin ≤ 60 pF - 16 MHz

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Table 13. DC characteristics (voltage range W, temperature range 4)

Symbol ParameterSpecific test conditions

(in addition to conditions specified in Table 10)

Min. Max. Unit

COUT(2) Output capacitance (Q) VOUT = 0 V - 8pF

CIN(2) Input capacitance VIN = 0 V - 6

ILI Input leakage current VIN = VSS or VCC - 2µA

ILO Output leakage current S = VCC, VOUT = VSS or VCC - 3

ICC Supply current (Read)

VCC = 2.5 V, fC = 10 MHz,C = 0.1 VCC/0.9 VCC, Q = open

- 2

mAVCC = 5.5 V, fC = 10 MHz,C = 0.1 VCC/0.9 VCC, Q = open

- 4

ICC0(1) Supply current (Write)2.5 V < VCC < 5.5 V, during tW,S = VCC

- 2(2)

ICC1Supply current (Standby power mode)

t° = 85 °C, VCC = 2.5 V, S = VCCVIN = VSS or VCC

- 2

µA


- 3


- 15


- 20


- 25


- 40

VIL Input low voltage - –0.45 0.3 VCC

V

VIH Input high voltage - 0.7 VCC VCC+1

VOL Output low voltage IOL = 2 mA - 0.4

VOH Output high voltage IOH = –2 mA 0.8 VCC -

VRES(2)Internal reset threshold voltage - 0.5 1.5

1. Average value during the Write cycle (tW)

2. Characterized only, not 100% tested


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Table 14. DC characteristics (voltage range W, temperature range 3)

Symbol ParameterTest conditions

(in addition to conditions specified in Table 11)

Min. Max. Unit

COUT(3) Output capacitance (Q) VOUT = 0 V - 8pF

CIN(3) Input capacitance VIN = 0 V - 6

ILI Input leakage current VIN = VSS or VCC - 2µA

ILO Output leakage current S = VCC, VOUT = VSS or VCC - 3

ICC Supply current (Read)

VCC = 2.5 V, C = 0.1VCC/0.9 VCC, Q = open fC = 10 MHz

- 2

mAVCC = 5.5 V, fC = 16 MHz(1)

C = 0.1 VCC/0.9 VCC, Q = open- 5

ICC0(2) Supply current (Write)2.5 V ≤ VCC < 5.5 V during tW,S = VCC

- 2(3) mA

ICC1 Supply current (Standby mode)

t° = 85 °C, VCC = 2.5 V, S = VCC, VIN = VSS or VCC

- 2

µA


- 3


- 15


- 20

VIL Input low voltage 2.5 V ≤ VCC < 5.5 V –0.45 0.3 VCC V

VIH Input high voltage 2.5 V ≤ VCC < 5.5 V 0.7 VCC VCC+ 1 V

VOL Output low voltage VCC ≥ 2.5 V, IOL = 2 mA - 0.4 V

VOH Output high voltage VCC ≥ 2.5 V, IOH = -2 mA 0.8 VCC - V

VRES(3) Internal reset threshold voltage - 0.5 1.5 V

1. When –40 °C < t° < 85 °C.

2. Average value during the Write cycle (tW)

3. Characterized only, not 100% tested

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Table 15. AC characteristics

Symbol Alt. Parameter

Min. Max. Min. Max.

Unit

Test conditions specified in

Table 10 and

Table 11

Test conditions specified in

Table 12

fC fSCK Clock frequency 10 16 MHz

tSLCH tCSS1 S active setup time 30 20

ns

tSHCH tCSS2 S not active setup time 30 20

tSHSL tCS S deselect time 40 25

tCHSH tCSH S active hold time 30 20

tCHSL S not active hold time 30 20

tCH(1)

1. tCH + tCL must never be lower than the shortest possible clock period, 1/fC(max).

tCLH Clock high time 40 25

tCL(1) tCLL Clock low time 40 25

tCLCH(2)

2. Value guaranteed by characterization, not 100% tested in production.

tRC Clock rise time 2 2µs

tCHCL(2) tFC Clock fall time 2 2

tDVCH tDSU Data in setup time 10 10

ns

tCHDX tDH Data in hold time 10 10

tHHCH Clock low hold time after HOLD not active 30 25

tHLCH Clock low hold time after HOLD active 30 20

tCLHL Clock low set-up time before HOLD active 0 0

tCLHHClock low set-up time before HOLD not active 0 0

tSHQZ(2) tDIS Output disable time 40 25

tCLQV(3)

3. tCLQV must be compatible with tCL (clock low time): if tSU is the Read setup time of the SPI bus master, tCL must be equal to (or greater than) tCLQV+tSU.

tV Clock low to output valid 40 25

tCLQX tHO Output hold time 0 0

tQLQH(2) tRO Output rise time 20 25

tQHQL(2) tFO Output fall time 20 25

tHHQV tLZ HOLD high to output valid 40 25

tHLQZ(2) tHZ HOLD low to output high-Z 40 25

tW tWC Write time 4 4 ms


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Figure 17. AC measurement I/O waveform

Figure 18. Serial input timing

Figure 19. Hold timing

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Figure 20. Serial output timing

Package mechanical data M95M01-A125 M95M01-A145

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9 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.

Figure 21. SO8N – 8-lead plastic small outline, 150 mils body width, package outline

1. Drawing is not to scale.

Table 16. SO8N – 8-lead plastic small outline, 150 mils body width, package mechanical data

Symbolmillimeters inches(1)

1. Values in inches are converted from mm and rounded to four decimal digits.

Typ. Min. Max. Typ. Min. Max.

A - - 1.75 - - 0.0689

A1 - 0.10 0.25 - 0.0039 0.0098

A2 - 1.25 - - 0.0492 -

b - 0.28 0.48 - 0.011 0.0189

c - 0.17 0.23 - 0.0067 0.0091

ccc - - 0.10 - - 0.0039

D 4.90 4.80 5.00 0.1929 0.189 0.1969

E 6.00 5.80 6.20 0.2362 0.2283 0.2441

E1 3.90 3.80 4.00 0.1535 0.1496 0.1575

e 1.27 - - 0.05 - -

h - 0.25 0.50 - 0.0098 0.0197

k - 0° 8° - 0° 8°

L - 0.40 1.27 - 0.0157 0.05

L1 1.04 - - 0.0409 - -

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Figure 22. TSSOP8 – 8-lead thin shrink small outline, package outline

1. Drawing is not to scale.

Table 17. TSSOP8 – 8-lead thin shrink small outline, package mechanical data

Symbolmillimeters inches(1)

1. Values in inches are converted from mm and rounded to four decimal digits.

Typ. Min. Max. Typ. Min. Max.

A - - 1.200 - - 0.0472

A1 - 0.050 0.150 - 0.0020 0.0059

A2 1.000 0.800 1.050 0.0394 0.0315 0.0413

b - 0.190 0.300 - 0.0075 0.0118

c - 0.090 0.200 - 0.0035 0.0079

CP - - 0.100 - - 0.0039

D 3.000 2.900 3.100 0.1181 0.1142 0.1220

e 0.650 - - 0.0256 - -

E 6.400 6.200 6.600 0.2520 0.2441 0.2598

E1 4.400 4.300 4.500 0.1732 0.1693 0.1772

L 0.600 0.450 0.750 0.0236 0.0177 0.0295

L1 1.000 - - 0.0394 - -

α - 0° 8° - 0° 8°

Part numbering M95M01-A125 M95M01-A145

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10 Part numbering

For a list of available options (speed, package, etc.) or for further information on any aspect of this device, please contact your nearest ST sales office.

Table 18. Ordering information schemeExample: M95M01-D W DW 4 T P /K

Device type

M95 = SPI serial access EEPROM

Device function

M01-D = 1 Mbit (128 Kbytes) plus Identification Page

Operating voltage

W = VCC = 2.5 to 5.5 V

Package(1)

1. All packages are ECOPACK2® (RoHS compliant and free of brominated, chlorinated and antimony-oxide flame retardants).

MN = SO8 (150 mils width)

DW = TSSOP8 (169 mils width)

Device grade

3 = –40 to 125 °C. Device tested with high reliability certified flow(2)

2. The high reliability certified flow (HRCF) is described in quality note QNEE9801. Please ask your nearest ST sales office for a copy.

4 = –40 to 145 °C. Device tested with high reliability certified flow(2)

Option

blank = Tube packing

T = Tape and reel packing

Plating technology

P or G = ECOPACK2®

Process letter

/K = Manufacturing technology code

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11 Revision history

Table 19. Document revision history Date Revision Changes

06-Jun-2012 1 Initial release.

30-Jul-2012 2– VCC range R3 replaced with range W3– Max clock frequency defined as 16 MHz when VCC > 4.5 V inside

the [-40 °C / +85 °C] temperature range

14-Feb-2013 3

– Removed UFDFPN8 (MLP8) package.– Updated VRES maximum value in Table 13: DC characteristics

(voltage range W, temperature range 4) and Table 14: DC characteristics (voltage range W, temperature range 3).

– Rephrased introduction of Section 3.5: Identification page and information about Identification page in Section 6: Delivery state.

– Deleted note(1) under Table 6: Instruction set.

10-Apr-2013 4

Document reformatted. Document status changed from “Preliminary data” to “Production data”. Updated note (1) under Table 8: Absolute maximum ratings.

04-Feb-2014 5

Changed Data retention from “40 years at 55 °C” to “50 years at 125 °C” in Features.Removed bullets in Section 4.2: Write Disable (WRDI) (refer to Section : WEL bit).Removed redundant sentence after Table 5: Device identification bytes.

31-Oct-2014 6

Updated Note 2 below Table 8: Absolute maximum ratingsUpdated Table 14: DC characteristics (voltage range W, temperature range 3)Updated Table 18: Ordering information scheme

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1 DescriptionTable 1. Signal names

2 Signal description2.1 Serial Data output (Q)2.2 Serial Data input (D)2.3 Serial Clock (C)2.4 Chip Select (S)2.5 Hold (HOLD)2.6 Write Protect (W)2.7 VSS ground2.8 VCC supply voltage

3 Operating features3.1 Active power and Standby power modes3.2 SPI modes3.3 Hold mode3.4 Protocol control and data protection3.4.1 Protocol control3.4.2 Status Register and data protectionTable 2. Status Register formatWIP bitWEL bitBP1, BP0 bitsTable 3. Write-protected block size

SRWD bit and W input signalTable 4. Protection modes

3.5 Identification pageTable 5. Device identification bytes

4 InstructionsTable 6. Instruction setTable 7. Significant bits within the address bytes4.1 Write Enable (WREN)4.2 Write Disable (WRDI)4.3 Read Status Register (RDSR)4.4 Write Status Register (WRSR)4.5 Read from Memory Array (READ)4.6 Write to Memory Array (WRITE)4.7 Read Identification Page (RDID)4.8 Write Identification Page (WRID)4.9 Read Lock Status (RDLS)4.10 Lock Identification Page (LID)

5 Application design recommendations5.1 Supply voltage (VCC)5.1.1 Operating supply voltage (VCC)5.1.2 Power-up conditions5.1.3 Power-down

5.2 Implementing devices on SPI bus5.3 Cycling with Error Correction Code (ECC)Example1: maximum cycling limit reached with 1 million cycles per byteExample2: maximum cycling limit reached with unequal byte cycling

6 Delivery state7 Absolute maximum ratingsTable 8. Absolute maximum ratings

8 DC and AC parametersTable 9. Cycling performance by groups of 4 bytesTable 10. Operating conditions (voltage range W, temperature range 4)Table 11. Operating conditions (voltage range W, temperature range 3)Table 12. Operating conditions (voltage range W, temperature range 3) for high-speed communicationsTable 13. DC characteristics (voltage range W, temperature range 4)Table 14. DC characteristics (voltage range W, temperature range 3)Table 15. AC characteristics

9 Package mechanical dataTable 16. SO8N – 8-lead plastic small outline, 150 mils body width, package mechanical dataTable 17. TSSOP8 – 8-lead thin shrink small outline, package mechanical data

10 Part numberingTable 18. Ordering information scheme

11 Revision historyTable 19. Document revision history

Date post:	27-Jan-2021
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